1. Center of Innovation for Complex Chronic Healthcare (CINCCH), Health Services Research and Development Service, Department of Veterans Affairs, Hines VA Hospital, Hines, Illinois, USA
2. Charlie Norwood Veterans Administration Medical Center, Augusta, Georgia, USA
3. Department of Medicine, Division of Rheumatology, Medical College of Georgia at Augusta University, Augusta, Georgia, USA
4. Department of Physical Medicine and Rehabilitation, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
5. Shepherd Center for Spinal Cord Injury Rehabilitation, Atlanta, Georgia, USA
6. Public Health Sciences, Parkinson School of Health Sciences and Public Health, Loyola University, Maywood, Illinois, USA